Rtty, Hf Packet & Sstv; Transmission; Programmable Tuning Steps - Yaesu FT-767GX Operating Manual

UHF. Then speak into the microphone and ad-
vance the MIC gain control until the PO meter
just starts to increase on voice peaks. Do
not advance the MIC gain further, or overmod-
ulation (and distortion) may result.
If desired, you can activate the RF speech
processor for AM transmissions. Set the METER
selector to COMP, and press the PROC switch.
Then close the PIT and adjust the PROC control
for 10dB compression (or less) during voice
peaks on the COMP meter scale (use the IF
monitor to listen to your transmissions as
described for SSB transmission).
The VOX system and clarifier control can also
be used with AM transmission (see 54.7,2).
4.7.6 RTTY, HF Packet & SSTV Transmission
Transmission of narrowband FSK (Fl; RTTY, SSTV
and Bell 103 HF packet) requires input of the
(equal level) audio tones (AFSK) at the PATCH
IN jack on the rear panel. Remove the micro-
phone from the MIC jack so that extraneous
sounds do not interfere with your transmitted
signal. The PROC and TX SHIFT switches must
be off.
Press the VOX button to allow automatic trans-
mit/receive switching (FULL BK-IN may also be
used), and select the FSK mode. Note that the
displayed frequency is the SSB carrier fre-
quency, so your actual MARK and SPACE frequen-
cies will be displaced from the display by the
audio frequencies of the tones.
Use the MIC gain control to adjust power out-
put while transmitting: if using full power
(100 watts), transmissions must be limited to
20 minutes to avoid overheating the power
supply.
After transmitting, if the cooling fan is on,
don't turn the POWER switch off until the set
has had a few minutes to cool and the fan
switch off.
See 84.17 for VHF packet operation.
4.8 Programmable Tuning Steps
Different tuning (and scanning) steps can be
programmed by the operator for each mode of
emission. Minimum steps are 10 Hz, and max-
imum steps are 99.99 kHz. Programmable steps
are active when tuning by the PROGRAM DOWN/UP
keys above the tuning knob, or by the micro-
phone UP/DWN buttons when the MIC U/D switch
às pressed. The default step size is 5 kHz in
all modes.
To reprogram tuning steps;
(1) Select the mode for which the new steps
are to be programmed.
(2) Press the orange FUNC key: the 10 MHz
frequency digit on the display will
blink.
(3) Press either the DOWN or UP PROGRAM
key: the display will now show the pre-
sent step size, with the 10 kHz digit
of step size blinking.
(4) Using the ten numbered keys, key in the
desired step size for this mode. For
example, to set 2.5 kHz steps, press
0250.
3-5
(5) Press the H/G (ENT) key to enter the
new step size into the step memory.
Now, when you press the PROGRAM DOWN/UP keys
the tuning steps will be as you have pro-
grammed when operating on the same mode.